I am writing a paper for my evolutionary biology class on lizards tails and how most can drop their tail but a few do not grow them back. I know the crested gecko does not regenerate its tail, but i was wondering if anyone else knew of any others. I am having major issues finding reputable sources and am interested in which other animals have this oddity. There must be more out the cresteds can't be the only permanet frog butts out there. Thanks for any answers i do get.

thanks everyone i know odd question i will definately see if i can find something about slow growing iguana tails and thanks floof for mentioning that beardies can't drop their tails. I still believe there must be more its not like cresties are the only ones that can drop and don't grow back.

I don't think agamids can regenerate their tails. Chameleons can't. I think cresteds are the only rhacodactylus that can't (gargoyles can at least). I think most of the skinks can regenerate tails. I think most phelsumas can. Some species can only regenerate the lost tail once. The original tail has the dropping mechanism, but a regrown tail doesn't. Cresteds are the only ones with the ability to autotomy who don't regenerate. It seems they "lost" the abilty to regenerate.